The Radium Fuel Surge Tank (FST-R) includes an integrated fuel pressure Regulator built in to the tank and recirculates fuel internally by s “Dead End” system. Fuel does not return from the engine/fuel rail. Excess fuel in the surge tank is returned back to the vehicle’s main fuel tank. The FST-R uses only one fuel pump. Pumps and install options are sold separately.

Vehicle Fitment:
• Universal Application

Install Instructions:
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Full Description:
A fuel surge tank (FST) is designed to prevent fuel starvation to the engine on vehicles with inadequate fuel tank baffling. The FST fuel pump feeds the fuel rail(s). The volume of fuel inside the surge tank acts as a buffer to always keep the FST pump supplied with fuel. This volume is maintained by the main fuel tank’s (lift) pump as well as the fuel returning from the fuel pressure regulator.

In the case of the FST-R, the regulator is built in to the surge tank and is recirculating fuel internally. Excess fuel in the surge tank is returned back to the vehicle’s main fuel tank.

Installing a surge tank is also an easy way to upgrade the fuel pump of a vehicle without opening or modifying the OEM fuel tank.

The FST-R is an all new design that houses a single internal fuel pump and has an integrated fuel pressure regulator machined into the top cap. The high-flow regulator is adjustable and features interchangeable orifice sizes. This revolutionary idea eliminates the need for an external fuel pressure regulator along with the extra fittings and hoses. This simplifies the installation, reduces overall cost, reduces weight, and eliminates potential leak points in the fuel system. Furthermore, this system permits cooler fuel temperatures as the fuel is not returning from the hot engine bay. Like all Radium fuel surge tanks, this universal product can be used on any fuel injected application and is compatible with all fuel types.

The side port is the regulated pressure output and is plumbed directly to the fuel rail(s). No additional fuel pressure regulator is required. Pressure adjustment is done using the adjustment screw located on the top cap of the regulator unit. A vacuum line hooks up to the nipple on the FST-R to achieve 1:1 vacuum reference. Note: return-less fuel systems commonly use a constant fuel pressure. In this case, the vacuum reference hose is not required.

Features: (Each kit will be different)
• Full CNC aluminum construction with O-ring sealed interfaces
• Anodized for compatibility with all fuel types
• Integrated adjustable fuel pressure regulator with 1:1 vacuum reference
• Interchangeable regulator orifice sizes to match output of different pumps
• Nickel-Plated Electrical Connector with 24″ Flying Leads
• Assembled with stainless steel hardware
• Three 6AN male fittings

Install Notes:
The fuel system plumbing using the FST-R is not a “return” type system. It is considered a “dead end” system. This is because fuel does not return from the engine/fuel rail. This is common practice on many modern OEM vehicles. It prevents warm fuel from returning to the gas tank and heating the entire fuel system.

Radium Engineering has not experienced fuel flow problems using “dead end” systems, even on very high horsepower applications.

Fuel Pressure Gauge with -6AN Inline Adapter:
Radium 20-0152 (Sold separately)

FST-R Mounting Options (Sold Separately)